This type of question
was asked in GATE 2013. Most of the students are not able to solve this
question and some who are able to solve it have taken minutes to solve this
question. But here on MeriView.in –Your Online Tuition Centre-we will tell you
the trick to solve this type of question. That trick will solve this type of
question in seconds. You just have to put the given terms into the formula and
you will get the answer.

The question and the trick is explained below.

Q:- a person travels a total journey of 120 kms. He travels
his half distance at a speed of 60 km/h and half of the remaining at a speed of 30 km/h and the last remaining
at a speed of 10 km/h. what is his average speed during the whole journey?